#encoding:utf8
#!/usr/bin/python
  
  
import RPi.GPIO as GPIO  
import time  
  
channel = 11            #引脚号16  
data = []           #温湿度值  
j = 0               #计数器  
  
GPIO.setmode(GPIO.BOARD)      #以BCM编码格式  
  
time.sleep(1)           #时延一秒  
  
GPIO.setup(channel, GPIO.OUT)  
  
GPIO.output(channel, GPIO.LOW)  
time.sleep(0.02)        #给信号提示传感器开始工作  
GPIO.output(channel, GPIO.HIGH)  
  
GPIO.setup(channel, GPIO.IN)  
  
while GPIO.input(channel) == GPIO.LOW:  
    continue  
  
while GPIO.input(channel) == GPIO.HIGH:  
    continue  
  
while j < 40:  
    k = 0  
    while GPIO.input(channel) == GPIO.LOW:  
        continue  
      
    while GPIO.input(channel) == GPIO.HIGH:  
        k += 1  
        if k > 100:  
            break  
      
    if k < 8:  
        data.append(0)  
    else:  
        data.append(1)  
  
    j += 1  
  
print "sensor is working."  
print data              #输出初始数据高低电平  
  
humidity_bit = data[0:8]        #分组  
humidity_point_bit = data[8:16]  
temperature_bit = data[16:24]  
temperature_point_bit = data[24:32]  
check_bit = data[32:40]  
  
humidity = 0  
humidity_point = 0  
temperature = 0  
temperature_point = 0  
check = 0  
  
for i in range(8):  
    humidity += humidity_bit[i] * 2 ** (7 - i)              #转换成十进制数据  
    humidity_point += humidity_point_bit[i] * 2 ** (7 - i)  
    temperature += temperature_bit[i] * 2 ** (7 - i)  
    temperature_point += temperature_point_bit[i] * 2 ** (7 - i)  
    check += check_bit[i] * 2 ** (7 - i)  
  
tmp = humidity + humidity_point + temperature + temperature_point       #十进制的数据相加  
  
if check == tmp:                                #数据校验，相等则输出  
    print "temperature : ", temperature, ", humidity : " , humidity  
else:                                       #错误输出错误信息，和校验数据  
    print "wrong"  
    print "temperature : ", temperature, ", humidity : " , humidity, " check : ", check, " tmp : ", tmp  
  
GPIO.cleanup()   
